I'm definitely hard on my
batteries.
I charge to 4.2v @ 2A, which reduces their cycles a lot. But it means I'm only charging them supervised, which is purely for piece of mind.
My new batteries go in my unregulated/mech mods. If I'm pulling them at 3.6v or below, I'm happy with the coil resistance I'm using. If I'm pulling them at 3.8v, then I change to a lower ohm coil.
After 6-9 months, I buy a new sets of batteries for the mech/unregulateds, and the old batteries go into my regulated mods. In a regulated mod, I usually pull at 3.2v-3.4v depending on the mod.
And if I would stop buying new setups, I wouldn't need so many batteries on the go!